Home
Class 11
PHYSICS
The length of needle foating on the surf...

The length of needle foating on the surface of water is 1.5 cm the force in addition to its weight required to lift the needle from water surface will be (surface tension of water `=7.5N//cm`)

A

22.5 N

B

2.25 N

C

0.25 N

D

225 N

Text Solution

Verified by Experts

The correct Answer is:
A
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ELASTICITY, SURFACE TENSION AND FLUID MECHANICS

    ALLEN|Exercise Exercise 1 (Fluid Statics)|40 Videos

  • ELASTICITY, SURFACE TENSION AND FLUID MECHANICS

    ALLEN|Exercise Exercise 2 (One or more than one correct answer)|53 Videos

  • ELASTICITY, SURFACE TENSION AND FLUID MECHANICS

    ALLEN|Exercise Exercise 1 (Elasticity)|16 Videos

  • CENTRE OF MASS

    ALLEN|Exercise EXERCISE-V B|19 Videos

  • ERROR AND MEASUREMENT

    ALLEN|Exercise Part-2(Exercise-2)(B)|22 Videos

Similar Questions

Explore conceptually related problems

the langth of a needle floating on water is 2.5 cm . How much minimum force in addition to the weight of the needle, will be needed to lift the needle above the surface of water ? Surface tension of water =7.2 xx 10^(-4) "Ncm"^(-1).

A small piece of wire of length 4 cm is floating on the surface of water. If a force of 560 dynes in excess of itss apparent weight is requried to pull it up from the surface find the surface tension of water.

Knowledge Check

  • The length of a needle floating on water is 2.5 cm . The minimum force in addition to its weight needed to lift the needle above the surface of water will be (surface tension of water is 0.072 N//m )

    A
    `3.6xx10^(-3)N`
    B
    `10^(-2)N`
    C
    `9xx10^(-4)N`
    D
    `6xx10^(-4)N`

  • The surface tension of pure water is

    A
    `0.065 `N/m
    B
    `0.072`N/m
    C
    `0.045` N/m
    D
    `0.045` dyne/cm

  • If the length of a needle floating on water is 2 cm then the additional force due to surface tension required to pull the needle out of water will be

    A
    `28xx 10^(-4)`N
    B
    `32xx10^(-4)`N
    C
    `14xx10^(-4)`N
    D
    `20xx10^(-4)`N

    • Similar Questions

    Explore conceptually related problems

    Addition of surface to water leads .

    A needle of length 3 cm is floating on the surface of water. Calculate the minimum force needed to lift the needle above the surface of water. Surface tension of water is 0.072 N/m.

    A needle of length 5 cm is floating on the surface of water. Calculate the minimum force needed to lift the needle above the aurface of water. Surface tension of water is 0.073 N/m.

    A needle or a pin floats on the surface of water because of

    Detergents ………… the surface tension of water.

    Home
    Profile